Darn, just looked and mine is a Relaxed nature. Even so, TBH, there's little point in training a competitive one; you can't use it on Battle Subway or Wifi battles NEway unless I'm mistaken? And aren't those the main areas to use competitively-raised Pokémon?
I can try running the Event a few more times and see if I luck out with a nature, but ATM, I have W2 in the older-model DS and Black in the 3DS, so not doing it right now.
Hey, I never saw your replies below until now because you posted here, not on my page. Just an FYI.
I did notice you are now looking for Giratina. Unbelievably, I have Giratina. Don't know the nature offhand, but hopefully this isn't an issue? I'd rather not AR the Event back on and do it over and over with another Giratina each time. :D
I already have a Dialga from the same Event (I will admit I did use AR on SS to reset the event twice, so that's how I have all three). I also have Keldeo, but I might be interested in collecting natures now that I have a full Pokédex. Thus, I might go for that Keldeo. (I'm a poet and I don't know it...)
And you are correct, it cannot check Event Pokémon with Ribbons. The good(?) news is that even if an Event is loaded into a system via an AR code (I know I've tried a few in 4th Generation myself, and I have to tell you, they work), it's still considered legal since it's a clone of the actual Event (just like using an AR to clone a Pokémon you already have). I turned on the Shiny Eevee VGC in SS one day and got one, pushed the button, immediately got the second, pushed the button again...and had a few when I left the Mart. LMAO I have a different one in Unova that I got via a trade, but it wasn't an Event and could be PokéChecked; the Event one cannot be unless it's in a battle video, and legendary Events canot be checked at all.
As noted, however, the Event Eevee in an Unova battle video - even if ARed - would still show as legal since the OT, nature, ability, moves, and everything else match perfectly (even if a move is changed, it's still legit. provided it's relearnable with a Heart Scale or from a TM/HM).
I have Mew UT, and still trying to acquire Deoxys. If you get Deoxys before Mew, and can clone (or are willing to have someone clone it, in which case I'd trade it back), I'd take Deoxys for Mew if you confirm it's legit. (not a hacked one, which is illegal here). I already have the Events you're offering.